Castelli's Rosso Corsa 9 sock features an excellent design and sits at the top of the line. It features a contemporary 9 inch cuff for those riders who go for a modern look. The Rosso Corsa has a supportive leg band to keep the sock in place, but it is not too restrictive as to disrupt circulation and comfort. This top cuff is doubled over and the stitching runs around your lower leg. The top section of the body of the sock is a diaphanous web which means it is super thin and aerated for maximum breathability. The rest of the body has a slightly thicker and more elastic composition to offer more support. Castelli added a compression band around the instep for a little more added support.
The entire sock is constructed of Meryl Skinlife which wicks moisture extremely well. It is also bacteriostatic, which is always a plus with footwear and socks. This is Castelli's best offering in a sock and as such carries the Rosso Corsa distinction.